This allows the balance to execute a rotary oscillation which is ultimately responsible for the even running of the watch. The balance spring is firmly fastened to the balance shaft. The balance, in combination with the hairspring, constitutes the oscillation system of a mechanical watch.īalances nowadays are nearly always closed metallic wheels with two or three spokes. In our model 1739 Ag B, we use a 935 Argentium® alloy. The principle of the surface oxide layer is reminiscent of the formation of a passive layer of chromium oxide, on which the corrosion protection of common stainless steels is based. This can be removed with an Argentium® care cloth. In addition, a golden hue develops rather than turning black. This layer considerably slows down the aforementioned tarnishing process. Argentium® silver now forms a protective film of germanium oxide on its surface. A similar surface reaction can be caused by contact with some disinfectants – for example, in swimming pools – or direct contact with some cleaning agents. This leads to the visible darkening, which can be reversed chemically with silver polishing cloths or suitable household remedies, such as contacted aluminium foil and salt water.
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However, silver reacts on its surface with sulphur, which is supplied by skin contact or from the atmosphere. Silver is a precious metal that is immune to corrosive material transformation processes, which are called ‘rusting’ in steel alloys. This tarnishing is not a sign of corrosion.
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Therefore, silver items such as cutlery or jewellery, if they are really free of electroplated coatings with rhodium, must be cleaned regularly. Silver in its pure form or in the common 925 sterling alloy is known to show tarnishing behaviour, which is noticeable by a superficial black discolouration. Colorless anti-reflective coatings are used, created using a precision-controlled coating technique, to ensure that the dials show their true color.ĭesignation for a silver alloy that is alloyed with the element germanium to form a tarnish protection. Sinn's sapphire crystals are always coated on both sides to ensure optimum readability. Multiple layers with different types of coating and thicknesses are required to create an anti-reflective effect at different wavelengths (colours) of visible light. A further precondition for mutual cancellation is that both waves must have the same amplitude. Such a displacement occurs because the light reflected from the surface of the glass has to travel slightly further than that from the surface of the coating to ensure overlapping. Destructive interference, in simple terms, is when two opposing waves are offset so that the peak of one wave always coincides with a trough of the other, thereby canceling each other out.
The layer needs to be thick enough for the light reflected from the different surfaces to cancel each other out through destructive interference. The light reflected from this layer overlaps with that from the glass itself.
The splitting of the light mentioned above then takes place both on the surface of the glass and also on the surface of the thin anti-reflective layer. This coating is generally vapor deposited onto the glass in a vacuum. Diffuse points of light and reflected images in non-antireflective glass can in some cases be more dominant than the dial itself.Ī very thin coating of a suitable translucent material is used to make glass anti-reflective. Reflections severely impair the readability of a watch they reduce both the light permeability of the crystal and also the clarity of the image. One day I will own a Chrono and maybe it will be a Stowa.When light hits a glass surface it splits in two: one part of the light is bounced back as a reflection, the other goes into the glass. Give them a chance and have a little faith in Schauer. Some are saying goodbye to the brand as a result.what? If your respect for the man is truly that monumental, respect him enough to know that he would never "dump his baby" of 25 years into the hands of an uncaring group that is going to abandon QC and CS and run the ship aground. Are these not considered ETAs? Don't jump my a$$ if I am getting this totally wrong. What's the 411 on their ability to source these movements? These movements are under the Swatch Group, no? They have yanked the ETAs from everyone else. Stowa is now a brand in my cross hairs especially with Unitas and Valjoux movements. I own several of those too and they are fine. I am a fan of ETAs but all my favorite brands are now using Sellita movements. I've never really looked at Stowa before. I came here as Stowa was mentioned in the Laco area.
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